公开(公告)号：US06182251B2

公开(公告)日：2001-01-30

申请号：US09198774

申请日：1998-11-24

申请人： Moe Rahnema ,  Zhen-Liang Shi ,  Ludong Wang ,  Yezdi Antia ,  Mohammad Soleimani

发明人： Moe Rahnema ,  Zhen-Liang Shi ,  Ludong Wang ,  Yezdi Antia ,  Mohammad Soleimani

IPC分类号： G06F1100

CPC分类号： H04L25/023

摘要： A method of channel estimation in a wireless communication system has steps of receiving a data burst comprising a plurality of portions of known data, and remaining data that is unknown; comparing reference data to each of the plurality of portions of known data and determining error for each of the portions of known data; averaging the determined error for predetermined ones of the portions of known data; and estimating error for at least a portion of the remaining data as a function of the determined error having been averaged.

摘要翻译： 在无线通信系统中的信道估计方法具有接收包括已知数据的多个部分的数据脉冲串和未知的剩余数据的步骤; 将参考数据与已知数据的多个部分中的每一个进行比较，并确定已知数据的每个部分的误差; 对已知数据的预定部分的所确定的误差进行平均; 以及根据所确定的误差的函数估计剩余数据的至少一部分的误差。

公开(公告)号：US07245930B1

公开(公告)日：2007-07-17

申请号：US09447684

申请日：1999-11-23

申请人： T G Vishwanath ,  Michael Parr ,  Zhen-Liang Shi ,  Simha Erlich

发明人： T G Vishwanath ,  Michael Parr ,  Zhen-Liang Shi ,  Simha Erlich

IPC分类号： H04B7/00

CPC分类号： H04B7/18532 ,  H04B1/69 ,  H04B2001/6912

摘要： A method for enabling synchronization of a communications terminal in a wireless communication system, and a corresponding acquisition system of the communications terminal, wherein the method consists of the steps of: receiving a burst at a receiver of the communications terminal, the burst containing a composite waveform including two or more component waveforms, wherein each of the two or more waveforms has a known frequency variation throughout the burst; detecting the presence of the composite waveform; and estimating a frequency offset and a timing offset of the composite waveform as received into the receiver, whereby synchronization is achieved.

摘要翻译： 一种用于实现无线通信系统中的通信终端和通信终端的相应采集系统的同步的方法，其中该方法包括以下步骤：在通信终端的接收机处接收脉冲串，该脉冲串包含复合 包括两个或多个分量波形的波形，其中两个或更多个波形中的每一个在整个脉冲串中具有已知的频率变化; 检测复合波形的存在; 并且估计接收到接收机中的复合波形的频率偏移和定时偏移，由此实现同步。

公开(公告)号：US06418158B1

公开(公告)日：2002-07-09

申请号：US09447685

申请日：1999-11-23

申请人： T. G. Vishwanath ,  Michael Parr ,  Zhen-Liang Shi ,  Simha Erlich

发明人： T. G. Vishwanath ,  Michael Parr ,  Zhen-Liang Shi ,  Simha Erlich

IPC分类号： H04L2730

CPC分类号： H04B7/2125

摘要： A waveform to be transmitted as a burst within a channel that is used for the synchronization of unsynchronized wireless communications terminals in a wireless communications system, and a method of synchronization involving the waveform, that consists of a composite waveform. The composite waveform comprises two or more component waveforms, wherein each of the two or more component waveforms has a known frequency variation throughout the burst. The composite waveform has a composite bandwidth on an order of an available channel bandwidth and each of said two or more component waveforms have a component bandwidth on the order of the available channel bandwidth. Furthermore, a range of values for the differences between the instantaneous frequencies of two of said two or more component waveforms is on an order of twice of said available channel bandwidth.

摘要翻译： 要在无线通信系统中用于同步非同步无线通信终端的信道内作为突发传送的波形，以及由复合波形组成的涉及波形的同步方法。 复合波形包括两个或更多个分量波形，其中两个或更多个分量波形中的每一个在整个脉冲串中具有已知的频率变化。 复合波形具有可用信道带宽的顺序的复合带宽，并且所述两个或更多个分量波形中的每一个具有在可用信道带宽的顺序上的分量带宽。 此外，所述两个或多个分量波形中的两个的瞬时频率之间的差异的值的范围是所述可用信道带宽的两倍。

公开(公告)号：US06349120B1

公开(公告)日：2002-02-19

申请号：US09205592

申请日：1998-12-04

申请人： Zhen-Liang Shi ,  Yezdi Antia ,  A. Roger Hammons, Jr.

发明人： Zhen-Liang Shi ,  Yezdi Antia ,  A. Roger Hammons, Jr.

IPC分类号： H04L2706

CPC分类号： H04L25/03828 ,  H04L27/2655

摘要： A method for improving spectral sampling using Discrete Fourier Transforms in a processor to detect a continuous wave (CW) signal in a burst having large initial uncertainties comprises the steps of dividing the burst into smaller sub-bursts; performing a Discrete Fourier Transform on each sub-burst; and non-coherently combining each sub-burst. A further variation includes selecting an optimal number L of sub-bursts based upon system performance, and desired detection performance at a minimum operating signal to noise ratio.

摘要翻译： 一种在处理器中使用离散傅立叶变换改进频谱采样的方法，用于检测具有大的初始不确定性的脉冲串中的连续波（CW）信号，包括以下步骤：将脉冲串划分成更小的子脉冲串; 对每个子突发执行离散傅里叶变换; 并且不相干地组合每个子突发。 进一步的变化包括基于系统性能选择最佳数量L的子脉冲串，并且以最小的操作信噪比选择期望的检测性能。

公开(公告)号：US06487251B1

公开(公告)日：2002-11-26

申请号：US09386053

申请日：1999-08-30

申请人： Yezdi Antia ,  Zhen-Liang Shi ,  A. Roger Hammons, Jr. ,  Olga Ritterbush

发明人： Yezdi Antia ,  Zhen-Liang Shi ,  A. Roger Hammons, Jr. ,  Olga Ritterbush

IPC分类号： H04L2701

CPC分类号： H04L1/0068 ,  H04L1/0041 ,  H04L1/007 ,  H04L1/08

摘要： A system and method for establishing an integrated forward error correction (FEC) scheme to perform multi-rate encoding on different priority data bits of a channel access message transmitted on a random access channel between devices of a communications network, such as between an access terminal and a base station of a satellite-based communications network. The channel access message includes a first data group representing first information and a second data group representing second information, which is transmitted between an access terminal and a base station in a satellite-based communications network. The system and method encodes the second data group at an encoding rate to provide a second encoded data group, and encodes the first data group at the same encoding rate to provide a first encoded data group. The encoding of the first and second data groups is performed by a single encoder, such as a rate ¼ convolutional encoder. The second encoded data group is transmitted from the access terminal to the base over a random access channel. The second encoded data group further can be punctured during transmission to in effect decrease its coding rate, for example, to rate ½ coding. The first encoded data group is transmitted from the access terminal to the base station, and is then retransmitted from the access terminal to the base station to in effect increase the rate of coding of the first encoded data group to, for example, ⅛ coding. At the base station, a combiner/demodulator combines the transmitted and retransmitted first encoded data group, and the combined first encoded data groups and the second encoded data group are then decoded by a decoder.

摘要翻译： 一种用于建立综合前向纠错（FEC）方案的系统和方法，用于对通信网络的设备之间在诸如接入终端之间的随机接入信道上发送的信道接入消息的不同优先级数据比特执行多速率编码 以及基于卫星的通信网络的基站。 信道接入消息包括表示第一信息的第一数据组和表示在基于卫星的通信网络中的接入终端和基站之间传输的第二信息的第二数据组。 该系统和方法以编码速率对第二数据组进行编码以提供第二编码数据组，并以相同的编码速率对第一数据组进行编码以提供第一编码数据组。 第一和第二数据组的编码由单个编码器执行，例如速率¼卷积编码器。 第二编码数据组通过随机接入信道从接入终端发送到基站。 第二编码数据组在传输期间还可以被打孔，从而实际上降低了其编码率，例如，对1/2编码进行速率估计。 第一编码数据组从接入终端发送到基站，然后从接入终端重传到基站，实际上将第一编码数据组的编码速率提高到例如1/8 编码。 在基站，组合器/解调器组合发送和重传的第一编码数据组，然后由解码器解码组合的第一编码数据组和第二编码数据组。